.l {
  float: left;
}
.r {
  float: right;
}
.c {
  text-align: center;
}
.t-l {
  text-align: left;
}
.t-r {
  text-align: right;
}
.vertical-align {
  position: relative;
  top: 50%;
  -webkit-transform: translateY(-50%);
  -ms-transform: translateY(-50%);
  transform: translateY(-50%);
}
.clearfix:after {
  content: ".";
  display: block;
  height: 0;
  clear: both;
  visibility: hidden;
}
.hide {
  display: none!important;
}
.mgt-20 {
  margin-top: 20px;
}
.mgt-40 {
  margin-top: 40px;
}
.app {
  width: 640px;
  margin: 0 auto;
  box-sizing: border-box;
  -webkit-transition: all .5s
}
.container {
  position: relative;
  width: 640px;
  height: 100%;
  box-sizing: border-box;
  //background-color: #312f56;
  background-color: #FFFFFF;
  background-size: cover;
  -webkit-transition: background 1s linear;
  transition: background 1s linear;
  &.orange {
    background-color: #ff8001;
  }
  &.brown {
    background-color: #d6c8be;
  }
  &.light-gray {
    background: #f6f6f6;
  }
}

.wechat-overlay {
  position: fixed;
  top: 0;
  right: 0;
  width: 100%;
  height: 100%;
  z-index: 1000;
  background: rgba(0, 0, 0, 0.5);
}
.wechat-dialog {
  font-size: 16px;
  position: absolute;
  top: 10px;
  right: 50px;
  width: 454px;
  height: 329px;
  padding: 50px 0;
  text-align: center;
  background: url("../img/share.png") no-repeat 0 0;
}
.wechat-highlight {
  color: #1da053;
}
.wechat-arrow {
  position: absolute;
  top: 30px;
  right: -10px;
  width: 100px;
  height: 40px;
  border: 1px solid rgba(0, 0, 0, 0);
  border-radius: 50%;
  border-bottom-color: #000;
  -webkit-transform: rotate(-60deg);
}
.wechat-arrow:after {
  content: "";
  position: absolute;
  width: 20px;
  height: 20px;
  border: 2px solid;
  bottom: -2px;
  right: 2px;
  border-left-color: rgba(0, 0, 0, 0);
  border-top-color: rgba(0, 0, 0, 0);
  -webkit-transform: rotate(-70deg);
}
.wechat-overlay {
  display: none;
}
@-webkit-keyframes reverseRotataZ {
  0% {
    -webkit-transform: rotateZ(0deg)
  }
  100% {
    -webkit-transform: rotateZ(-360deg)
  }
}

.u-globalAudio {
  position: absolute;
  top: 20px;
  width: 64px;
  height: 64px;
  right: 20px;
  z-index: 100;
  cursor: pointer;
  //-webkit-animation: reverseRotataZ 1.2s linear infinite;
  background: url("../img/slide/music@43x64.png") no-repeat center 0;
  &.z-pause {
    opacity: 0.5;
  }
  &.z-play {
    opacity: 1;
  }
  span {
      position: absolute;
      left: -50px;
      top: 20px;
      font-size: 24px;
      color: #950000;
      letter-spacing: 2px;
      -webkit-transition: all .2s linear;
      opacity: 0;
      -webkit-transform: translateX(-20px);
      &.z-show {
        opacity: 1;
        -webkit-transform: translateX(0px)
      }
  }
}